TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 537: Impact of Asphalt Thickness on Pavement Quality documents transportation agency policy for lift thickness and minimum compaction requirements on resultant asphalt pavement quality.
To achieve expected pavement performance, it is important that asphalt concrete (AC) have adequate density. A critical factor in achieving this density is the ratio of lift thickness to nominal maximum aggregate size (t/NMAS).
The information in the report is designed to help make agencies aware of a range of practices other agencies use to achieve a desired t/NMAS ratio, ensuring that density of AC is adequate to meet expected pavement performance.
Table of Contents
|Chapter 1 - Introduction||3-5|
|Chapter 2 - Literature Review: Effects of Lift Thickness on Pavement Performance||6-22|
|Chapter 3 - Survey Results: Current Practices Regarding Lift Thicknesses||23-43|
|Chapter 4 - Case Examples||44-50|
|Chapter 5 - Conclusions and Further Research||51-54|
|Appendix A - State Survey Questionnaire||60-66|
|Appendix B - Industry Survey Questionnaire||67-71|
|Appendix C - Tabulated State Survey Responses||72-102|
|Appendix D - Tabulated Industry Survey Responses||103-120|
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